Man charged in slaying before shootout with police

A 24-year-old man was charged today with fatally shooting a man and later firing at officers who saw the slaying and tried to apprehend him, officials said.

Jason Walker of the 7100 block of South Union Street was charged with first-degree murder, attempted first-degree murder and aggravated discharge of a firearm, police said.

Shortly before 10 p.m. Tuesday, officers on patrol near the 7800 block of South Marshfield Avenue heard several shots and responded to the direction of the gunfire, police said.

Officers then saw a man, later identified as Walker, firing a gun at a man, fatally striking him. The officers gave chase and Walker fired in their direction. One of the officers fired back, striking him, police said.

The man shot by the gunman was dead at the scene, police said. He was identified at the Cook County medical examiner's office as Brian Nailer, 31, of the 10000 block of South Wallace Street.

Walker was taken to Advocate Christ Medical Center in Oak Lawn. Police recovered a handgun, a mask and gloves at the scene, according to Pat Camden, a spokesman for the Fraternal Order of Police.

An officer was also taken to the hospital for observation with non-life threatening injuries, police said.